JP-7855990-B2 - Vehicle anomaly detection system

Inventors

• 川上 尚也

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20221121

Claims (4)

1. A vehicle abnormality detection system comprising a first sound collector, a second sound collector, and a control device for detecting abnormalities in the vehicle, The first sound collector and the second sound collector are positioned at different locations on the vehicle. The control device is While the vehicle is in motion, first sound data is acquired from the first sound collector, and second sound data is acquired from the second sound collector. First sound pressure data for each frequency is obtained from the first sound pressure waveform corresponding to the first sound data, and second sound pressure data for each frequency is obtained from the second sound pressure waveform corresponding to the second sound data. If it is determined that both the first sound pressure change amount obtained by comparing the first sound pressure data acquired at different timings and the second sound pressure change amount obtained by comparing the second sound pressure data acquired at different timings are greater than or equal to a threshold change amount, an abnormality in the vehicle is detected. Based on the time difference between the first sound pressure waveform and the second sound pressure waveform, the location where the abnormality occurred is identified. A vehicle anomaly detection system characterized by the following:
2. The control device estimates the location of the abnormal noise generated in the vehicle based on the time difference, and if it estimates that the location of the noise is the vehicle's tailpipe, it identifies the particulate matter collection device contained in the vehicle's exhaust as the location of the noise. The vehicle abnormality detection system according to feature 1.
3. The control device performs machine learning on the combination of the time difference, the first sound pressure data, and the second sound pressure data, and identifies the location where the abnormality occurs based on the trained model obtained by machine learning on the combination. The vehicle abnormality detection system according to claim 1 or 2.
4. The control device learns the initial sound pressure level of at least one of the first and second sound collectors using machine learning, and if it determines that the sound pressure level has decreased relatively based on the learned model, it corrects the sound pressure level of the one of the first and second sound collectors whose sound pressure level has decreased to return it to the initial sound pressure level. The vehicle abnormality detection system according to claim 1 or 2.

Description

This invention relates to a vehicle anomaly detection system. The exhaust system of an engine includes an exhaust manifold and exhaust pipes. Exhaust from the engine is collected by the exhaust manifold and discharged into the exhaust pipes. The exhaust contains harmful substances such as unburned gases (carbon monoxide and hydrocarbons), nitrogen oxides, and particulate matter. To remove these harmful substances from the exhaust, the exhaust pipes are equipped with exhaust aftertreatment devices, including a catalytic converter and a collection device. Particulate matter collection devices may be removed due to theft or vehicle modification. If the engine is operated with the collection device removed, the amount of particulate matter released into the outside air may exceed regulatory limits. Therefore, a technology has been proposed to diagnose the removal of the collection device using a first exhaust temperature sensor that detects the temperature of the exhaust gas flowing into the collection device and a second exhaust temperature sensor that detects the temperature of the exhaust gas flowing out of the collection device (see, for example, Patent Document 1). Japanese Patent Publication No. 2020-112039 This is an example of a vehicle's underside view.This is a schematic diagram showing the configuration of the engine, ECU (Electronic Control Unit), and malfunction notification device.This flowchart shows an example of a process performed by the ECU.This is an example of an NV (Non-Voltage) detection map.This diagram illustrates the detection of vehicle malfunctions. The embodiments for carrying out the present invention will be described below with reference to the drawings. As shown in Figure 1, the engine 10 is located in the engine compartment at the front of the vehicle 100. The engine 10 may be a gasoline engine or a diesel engine. An exhaust system 20 is connected to the engine 10. The exhaust system 20 extends in the longitudinal direction of the vehicle 100. The exhaust system 20 includes an exhaust manifold 21 and an exhaust pipe 22. The exhaust system 20 also includes a catalytic converter 40 and a collection device 50 as exhaust aftertreatment devices. The exhaust system 20 also includes a muffler 60 and a tailpipe 70. The catalytic converter 40, collection device 50, muffler 60, and tailpipe 70 are arranged sequentially from the front to the rear of the vehicle 100. Furthermore, the collection device 50 is sometimes called a GPF (Gasoline Particulate Filter) when the engine 10 is a gasoline engine. When the engine 10 is a diesel engine, the collection device 50 is sometimes called a DPF (Diesel Particulate Filter). The interior of vehicle 100 is equipped with a front first sound collector 110, a front second sound collector 120, a rear sound collector 130, a steering wheel 140, and the like. For example, the front first sound collector 110 is positioned near the driver's seat 111. The front second sound collector 120 is positioned near the passenger seat 121. The rear sound collector 130 is positioned near the rear seat 131. Furthermore, the number of sound collectors is not limited to three; it may be two, or four or more. For example, any two of the front first sound collector 110, front second sound collector 120, and rear sound collector 130 may be installed in the vehicle interior as the first and second sound collectors. Alternatively, other sound collectors different from the front first sound collector 110, front second sound collector 120, and rear sound collector 130 may be installed in the vehicle interior. The positions of the sound collectors may also be changed as appropriate. For example, the front first sound collector 110, front second sound collector 120, and rear sound collector 130 may be positioned on the ceiling of the vehicle interior 100, or on the doors of the vehicle 100. The front first sound collector 110, the front second sound collector 120, and the rear sound collector 130 all include microphones and collect various sounds generated by the vehicle 100. For example, the front first sound collector 110, the front second sound collector 120, and the rear sound collector 130 collect exhaust noise from the tailpipe 70. The front first sound collector 110, the front second sound collector 120, and the rear sound collector 130 may also collect sounds generated by the sound collection device 50 or sounds generated by the engine 10. Referring to Figure 2, the engine 10, catalytic converter 40, collection device 50, ECU 200, and abnormality notification device 300 will be described in detail. The ECU 200 is installed in the vehicle 100. For example, an abnormality detection system for the vehicle 100 can be realized using the ECU 200, the aforementioned front first sound collector 110 (or front second sound collector 120), and the rear sound collector 130. The engine 10 generates power to drive the vehicle 100 by burning fuel injected from the fuel injector 12 inside